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Wedges
Simple Machines
From $24.95
Nancy Dickmann
Screws
Simple Machines
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Nancy Dickmann
Ramps
Simple Machines
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Nancy Dickmann
Pulleys
Simple Machines
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Nancy Dickmann
Levers
Simple Machines
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Nancy Dickmann
States of Matter
Science Starters
$24.95
Nancy Dickmann
Waste
Science Starters
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Anne O'Daly
Simple Machines
Science Starters
$24.95
Nancy Dickmann
Pollution
Science Starters
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Anne O'Daly
Natural Resources
Science Starters
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Nancy Dickmann
Light
Science Starters
$24.95
Anne O'Daly
Human Body
Science Starters
$24.95
Nancy Dickmann